# How does HCl act as a strong acid?

Sep 16, 2017

Its ionization in aqueous solution is reasonably complete.....

#### Explanation:

And thus for $H C l \left(a q\right)$, the following equilibrium......

$H C l \left(a q\right) + {H}_{2} O \left(l\right) r i g h t \le f t h a r p \infty n s {H}_{3} {O}^{+} + C {l}^{-}$

Lies almost entirely to the right........

...and ${K}_{a} = \frac{\left[{H}_{3} {O}^{+}\right] \left[C {l}^{-}\right]}{\left[H C l \left(a q\right)\right]}$ IS NUMERICALLY LARGE.